Understanding the Javascript Regexp Object
Arrays in Javascript
One hundred lines of Caml - A neat looking language. Nowadays, you want to learn lots of different kinds of languages, and use each where it's best suited. This is great, it encourages people to think in a more language neutral way, and to hopefully abandon those old religious wars over languages.
Aligning tables in HTML - I recently needed
td valign="top"
Structured Data with Ruby - A good basic primer to the data structures in Ruby.
Strings in Ruby
Hashes in Ruby
Ruby Quickreference
Fun with strace and GDB - Exploring your Linux system. Neat.
Egyptian Fractions - Very interesting. I wonder what math and science will be like in 3000 years. Will humans still be around?